Darcy friction factor
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The Darcy friction factor is a dimensionless number used in internal flow calculations. It expresses the linear relationship between mean flow velocity and pressure gradient.
It is defined as:
<math> f = \frac{(\frac{-d p*}{d x}) D_h}{0.5 \rho V^2} <math>
where:
- <math>\frac{-d p*}{d x}<math> is the pressure drop per unit length
- <math>D_h<math> is the hydraulic diameter
- ρ is the fluid density
- V is the bulk velocity